Activation/de-activation mechanism for one scg and scells, and conditional pscell change/addition

A wireless transmit/receive unit (WTRU), comprising a transceiver and one or more processors, configured to:

• receive, from a network, one or more conditions for a deactivation of a secondary cell group (SCG);
• evaluate the one or more conditions for the deactivation of the SCG;
• determine, based on the evaluation of the one or more conditions for the deactivation of the SCG, a deactivation preference of the SCG;
• and
• transmit, in an assistance information message based on expiry of an SCG deactivation preference indication prohibit timer, information indicating the deactivation preference of the SCG to the network.

A method performed by a first wireless transmit/receive unit (WTRU), the method comprising:

• receiving, from a network, one or more conditions for a deactivation of a secondary cell group (SCG);
• evaluating the one or more conditions for the deactivation of the SCG;
• determining, based on the evaluation of the one or more conditions for the deactivation of the SCG, a deactivation preference of the SCG;
• and
• transmitting, in an assistance information message based on expiry of an SCG deactivation preference indication prohibit timer, information indicating the deactivation preference of the SCG to the network.

A system comprising:

• one or more processors;
• and
• memory coupled with the one or more processors, the memory storing executable instructions that when executed by the one or more processors cause the one or more processors to effectuate operations comprising:
• receiving, from a network, one or more conditions for a deactivation of a secondary cell group (SCG);
• evaluating the one or more conditions for the deactivation of the SCG;
• determining, based on the evaluation of the one or more conditions for the deactivation of the SCG, a deactivation preference of the SCG;
• and
• transmitting, in an assistance information message based on expiry of an SCG deactivation preference indication prohibit timer, information indicating the deactivation preference of the SCG to the network.